Zionsville is a village mostly in Upper Milford Township, Lehigh County, and also in Lower Milford Township, Lehigh County, Pennsylvania, United States. Its zip code is 18092. The West Branch Hosensack Creek forms its natural SE boundary and drains it via the Hosensack Creek to the Perkiomen Creek in Palm.
As of the 2010 census, the population of the 18092 zip code was 3,223. 97.1% of the population is white, 0.3% is black, 0.2% is Native American, and 1.1% is Asian. The zip code is in Upper and Lower Milford Townships and to a very small extent in Hereford Township, Berks County.
Post office closure
In January 2009, the Zionsville Post Office closed after the owners of the building in which the U.S. Postal Service was located refused to renew the lease. It served portions of Upper Milford, Lower Milford, and Hereford Townships, including the villages of Corning, Dillingersville, Hosensack, Powder Valley, Sigmund, and some Five Points, Berks County residents. The residents of the zip code 18092 have since been served by the Hereford Post Office, but allowed to maintain the use of "Zionsville 18092" as a legal part of their addresses. Zionsville PO Box customers have been hosted by the Old Zionsville Post Office while packages and certified mail that have to be signed for must be picked up in Hereford.